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What can the creators of Heroes do to increase profits?
Improve the graphics?
Yes, this is what attracts most customers now.
Among the old fans of the series, there will likely be mostly fans of Heroes of Might and Magic V.
Moreover, many of them (fans of the fifth installment) prefer it to the third one precisely because of the graphics.
Change the engine?
Make the battles real-time, like in Warcraft or Total War. Many buyers will be attracted to this, but true fans will likely ignore this game, and the main phrase, I think, will be "this is no longer Heroes." And they are unlikely to accept the game as a continuation of their favorite universe.
In any case, the developers (let's call them that :D) primarily think about the amount of money they can earn, not about the canon.